package com.xingkeduo.utils;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;

import java.awt.image.BufferedImage;
import java.util.Collections;

public class QRCodeUtils {


    private static final int BLACK = 0xFF000000;
    private static final int WHITE = 0xFFFFFFFF;

    public static BufferedImage genGR(String website) {

        try {
            BitMatrix bm = new MultiFormatWriter().encode(website,
                    BarcodeFormat.QR_CODE,
                    300,
                    300,
                    Collections.singletonMap(EncodeHintType.CHARACTER_SET, "utf-8"));

            return toImage(bm);
        } catch (WriterException e) {
            e.printStackTrace();
        }
        return null;
    }

    private static BufferedImage toImage(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
            }
        }
        return image;
    }
}
